+ Color:
+ rgba: self.line_cross_color
+ Line:
+ points: self.x + self.line_width + 3, self.y + self.line_width + 3, self.x + self.width - 2 * self.line_width - 3, self.y + self.height - 2 * self.line_width - 3
+ width: self.line_width
+ Line:
+ points: self.x + self.line_width + 3, self.y + self.height - 2 * self.line_width - 3, self.x + self.width - 2 * self.line_width - 3, self.y + self.line_width + 3
+ width: self.line_width